[pynput] Fix annotations of Controller.Key(Code) (#8722)

Document stubtest entries

Author: AlexWaygood

stubs/pynput/@tests/stubtest_allowlist.txt

@@ -1,9 +1,7 @@
-# TODO: go through this allowlist, figure out which of them are false positives
-pynput.keyboard.Controller._Key
-pynput.keyboard.Controller._KeyCode
+# These __init__ methods have *args, **kwargs arguments on some platforms, but not others
 pynput.keyboard.Controller.__init__
+pynput.mouse.Controller.__init__
+# stubtest issues with non-`type` metaclasses, see https://github.com/python/mypy/issues/13316
+pynput.keyboard.Controller._Key
 pynput.keyboard._base.Controller._Key
-pynput.keyboard._base.Controller._KeyCode
 pynput.keyboard._dummy.Controller._Key
-pynput.keyboard._dummy.Controller._KeyCode
-pynput.mouse.Controller.__init__

stubs/pynput/pynput/keyboard/_base.pyi

@@ -86,8 +86,8 @@ class Key(enum.Enum):
     scroll_lock: int
 
 class Controller:
-    _KeyCode: ClassVar[KeyCode]  # undocumented
-    _Key: ClassVar[Key]  # undocumented
+    _KeyCode: ClassVar[type[KeyCode]]  # undocumented
+    _Key: ClassVar[type[Key]]  # undocumented
 
     class InvalidKeyException(Exception): ...
     class InvalidCharacterException(Exception): ...